遺書(いしょ)

いしょ
noun
farewell letter; written last words; suicide note
communication
1. farewell letter; written last words; will
A document left behind by a deceased person, expressing their final wishes, instructions, or messages to the living.
遺書(いしょ)を書(か)き残(のこ)す。
To leave a farewell letter.
A farewell letter from my grandfather was found.
The letter was full of words of thanks to the family.
2. suicide note
A note or letter left behind by a person who has taken their own life.
No suicide note was left behind.
A suicide note had been placed on the desk.
The police determined it was suicide based on the contents of the note.

遺書(いしょ) is any final written message left by someone who has died, including personal letters and suicide notes. A will in the legal sense, dealing with property, is 遺言(ゆいごん) or, formally, 遺言書(ゆいごんしょ) (lawyers read 遺言(いごん)).

Common collocations